Fan



April 22, 1930.

G. o. BISHOP 1,755,863

v FAN Filed sept. 2e, 1927 2 sheets-sheet 1 vIvry-1. f'

Geazye 0. ihap,

A TTORNEY.

Apiil 22, 1930.

G. O. BISHOP FAN Filed Sept. 26, 1927 2 Sheets-Sheet 2 INVENTOR. George 0. 5710,15

ATTORNEY.

Patented Apr. 22, 1930` esoneri o. BISHOP, or SALT LAKE CITY, UTAH FAN Application filed September 26, 1927. Serial No. 222,165

This invention relates to fans, and is designed primarily for moving large volumes of air at low pressure, especially, being adapted to heating and Ventilating work, more 5 especially for warm air furnace work, and the straight line' parallel to the shaft, driving the fan of the four blade type and with the blades v rotor.

vide, in a manner ris/hereinafter set forth, a

so constructed and set to cause the air to pass between the blades at high velocity and practically noiseless.

Further objects of the invention are to provide, in a manner as hereinafter set forth, a

fan which is simple in its construction and arrangement, strong, durable, compact, thoroughly eicient in inl its use, `and comparatively inexpensive to set up.,

-With the foregoing and other objects in '25 View the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically described, and illustrated in the accompanying drawings, wherein is shown an embodiment of the invention, but it is -to be understood characters denote that changes, variations and modifications can be resorted to which fall within the scope of the claim hereunto appended.

In the drawings wherein like reference corresponding parts throughout the several views:

Figure 1 is a frontelevation of a fan in accordano@l with this invention, and showing the fan-connected to the driving means therefor.

Figure 2 is a top plan view of the fan and the driving means therefor.

Figure 3 is a rear elevation of the fan.

Figure 4 is a section on line 4 4 Figure 1.

Figure 5 is a section on line 5`5 Figure l.

Figure 6 is a section on line 6 6 Figure 1.

Referring to the drawings in detail 1 denotes a base upon which is secured a motor 2 for driving the fan and the latter is secured to the motor shaft 3.

A. further object of the invention is to pro- As illustrated the fan comprises a hub 1.1,v having formed integral therewith a set of blades, four in number and indicated at 5, 6, 7 and '8. The hub 4 is formed with an opening 9 having a threaded wall with which en gages a suitable holdfast device for securing the hub 4 to the shaft 3. Preferably the fan is cast solid from aluminum to lmake the 0peration thereof all the more noiseless.

The blades at their points ofjoinder with the periphery of thehub 4 are equally spaced with respect to each other. Each blade is formed with a straight leading edge, a convaxed vouter end edge and a convexed follower e ge.

Each blade is diagonally disposed with respect to the hub, and the blade at its inner end is set at 36, at its center at 24 and at its tip 18, angle, so that pressureis built up and the air propelled in practically 'ioy straight lines parallel with the shaft. Each I blade gradually decreases in thickness from its outer towards its inner end. The follower edge of the blade, at the inner end thereof, projects beyond the outer peripheral face of the hub. The blade increases in width from its inner end to a point removed from its outer end and then decreases in width from said point to its outer end. The widest part of the blade is positioned forwardly with respect to the transverse median of the blade. The y blade is concavo-convex in transverse section from a point'in proximity to its in# ner end to the tip or outer end thereof. rlhe follower portion of the blade overhangs the leading portion thereof which is provided for by setting up the blade of torsional curvature. The curvature of the blades, together with the particular angles which each blade is set as before'stated, causes the air to pass through the blades at a high velocity and practically noiseless.

The fan will move large volumes of air at Alow pressure, and it is especially adapted for heat-ing and Ventilating work, then furthermore the construction and arrangement ofv the blades'relative to the hub will propel the air in practically a, straight line and therefan, in accordance with this invention, can

' .he readily understood tion being portion and positioned outwardly with respefct to the latter, ing edge strai L outer en reslmctto the inner portion of the fo and although the preferred embg'dment o the inventionis as illustrated and rdescribed, yet it is to be understood that chan es in the details of construction can be ha, `which will fall within the scope .of the invention' as claimed.

What I Qlaim is 4' An air moving fan for warm air furnace work comprising'l la hub having extending therefrom four equally`spaeed lades, each of said blades having its body diagonally disposed throughout with respect to the hub and with/theangle of inclination of said body gra'diallI decreasing froml the inner to the thereof, said body having its inner face-for a portion of its length concave and the remaining portion Hat, saidconcave porof greaterv length than sai body havingit's leadht throughout, its outer edge convex throng out and' its follower edge convex' throughout, the inner portion of said leading edge being positioned outwardlylwith ower edge of an *adj acent body, said follower edge terminating in said huband said leading lde having its inner portion spaced from the u g p e In testimony whereof, I aiiixmy'signature hereto. v v

` 4 GEORGE O. BISHOP.

said flat 

